ADJ

master, skeleton
duplicate, spare
car, desk, front door, house, ignition, etc.

QUANT

bunch, set
a large bunch of keys a set of car keys

VERB + KEY

turn
She turned the key in the lock
insert, put in
remove, take out
use
She must have used a key to get in

KEY + VERB

open, unlock
You need a key to open the garage
lock
turn
They heard a key turn in the back door lock

PREP

with a/the ~
You have to close it with the key
~ to
the key to the front door

PHRASES

get a key cut
I'll get another key cut so that you can have one

ADJ

Alt, arrow, backspace, control, delete, escape, function, return, shift, etc.
shortcut
F1 is the shortcut key for calling up help

QUANT

row
the top row of keys

VERB + KEY

hit, hold down, press, touch
Hold down the Alt key while pressing the arrow keys
release

KEY + VERB

tell sb sth
The key tells you what all the symbols mean

PREP

in a/the ~
You can find the symbols in the key at the bottom of the page
~ to
the key to the signs and symbols

VERB + KEY

have, hold
First-time voters could hold the key to the election result

PREP

~ to
Language is the key to understanding those around you

ADJ

major, minor
high, low

VERB + KEY

change

KEY + VERB

change
The key changes from C major to A minor

KEY + NOUN

change
signature
There are two sharps in the key signature of D major

PREP

in a/the ~
What key's it in? Can we try it in a lower key?
~ of
the key of G major